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@Article{MatsunagaSiAmSaDaOl:2022:EvCrCo,
           targetfile = "matsunaga_2022_evapotranspiration.pdf",
             keywords = "Allium cepa L, Soil water balance, Water need, Allium cepa L., 
                         balan{\c{c}}o h{\'{\i}}drico do solo, necessidade 
                         h{\'{\i}}drica.",
               volume = "26",
                pages = "219--225",
             abstract = "This study aimed to determine crop evapotranspiration through the 
                         soil water balance, the crop coefficient and water use efficiency 
                         of the onion (Allium cepa L.) in a system with four irrigation 
                         regimes, cultivated in the semiarid region of northeastern Brazil. 
                         Two field experiments were carried out during the rainy and dry 
                         periods of the region in 2018, using the treatments of 100% (T1), 
                         75% (T2), 50% (T3) and 25% (T4) of the reference 
                         evapotranspiration for daily water replacement and five replicates 
                         for each treatment. It was verified that crop evapotranspiration 
                         varies according to the water availability in the soil; however, 
                         the highest water use efficiency occurred for the T3 treatment. 
                         The T1 treatment obtained the highest estimated yield, 43.86 tons 
                         ha-1, while T4 obtained 13.47 tons ha-1, the lowest estimated 
                         yield among the treatments, and this difference was statistically 
                         significant (p \≤ 0.05) by F test. The crop coefficients 
                         obtained were 0.68, 0.89, 0.99 and 0.73 for the initial, 
                         vegetative, bulbing and maturation stages, respectively. RESUMO: 
                         Este estudo objetivou determinar a evapotranspira{\c{c}}{\~a}o 
                         da cultura atrav{\'e}s do balan{\c{c}}o de {\'a}gua no solo, o 
                         coeficiente de cultivo e a efici{\^e}ncia do uso da {\'a}gua da 
                         cebola (Allium cepa L.) em um sistema com quatro regimes de 
                         irriga{\c{c}}{\~a}o, cultivada no semi{\'a}rido nordestino. 
                         Foram realizados dois experimentos de campo durante os 
                         per{\'{\i}}odos chuvoso e seco da regi{\~a}o no ano de 2018, 
                         utilizando-se os tratamentos de 100% (T1), 75% (T2), 50% (T3) e 
                         25% (T4) da evapotranspira{\c{c}}{\~a}o de refer{\^e}ncia para 
                         reposi{\c{c}}{\~a}o h{\'{\i}}drica di{\'a}ria e cinco 
                         repeti{\c{c}}{\~o}es para cada tratamento. Verificouse que a 
                         evapotranspira{\c{c}}{\~a}o da cultura varia de acordo com a 
                         disponibilidade h{\'{\i}}drica no solo, entretanto, a maior 
                         efici{\^e}ncia do uso da {\'a}gua ocorreu para o tratamento T3. 
                         O tratamento T1 obteve a maior produtividade estimada em 43.86 
                         tons ha-1 e T4 com 13.47 tons ha-1, a menor produtividade estimada 
                         entre os tratamentos. Essa diferen{\c{c}}a foi estatisticamente 
                         significativa (p \≤ 0,05) pelo teste F. Os valores do 
                         coeficiente de cultivo obtidos foram de 0,68; 0,89; 0,99 e 0,73 
                         para as fases inicial, vegetativo, bulbifica{\c{c}}{\~a}o e 
                         matura{\c{c}}{\~a}o, respectivamente.",
                  doi = "10.1590/1807-1929/AGRIAMBI.V26N3P219-225",
                  url = "http://dx.doi.org/10.1590/1807-1929/AGRIAMBI.V26N3P219-225",
               author = "Matsunaga, Wendy K. and Silva, Vicente P. R. and Amorim, 
                         Vict{\'o}ria Pereira and Sales, Eliton S. G. and Dantas, Silvia 
                         M. and Oliveira, Andr{\'e} B.",
          affiliation = "{Universidade Federal de Campina Grande (UFCG)} and {Universidade 
                         Federal de Campina Grande (UFCG)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Universidade Federal de Campina 
                         Grande (UFCG)} and {Universidade Federal de Campina Grande (UFCG)} 
                         and {Universidade Federal de Campina Grande (UFCG)}",
              journal = "Revista Brasileira de Engenharia Agricola e Ambiental",
             language = "en",
                 year = "2022",
                 issn = "1415-4366",
                title = "Evapotranspiration, crop coefficient and water use efficiency of 
                         onion cultivated under different irrigation depths",
               number = "3",
        urlaccessdate = "30 jun. 2022"
}


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